Hopefully Genius Sonority won't be developing it again.
As for the RPG mode - if there is one, that is - don't make it so rigid! I would like to see it structured such that we wouldn't need to get the same exact Pokemon as everyone else. Randomize things up a bit! Where one person might find Carvanhas, another would find Hoppips. Making small changes in the game such as that - allowing this game to become a truly unique experience - is what I feel will make or break this game.
Then again, I'm not expecting them to do anything of the sort lest they deem it too "radical".
Joe, I would find it strange for them not to include an RPG mode, since the only thing of much interest would then be the battle features. I doubt many would get it if it just had minigames and storage space for Pokemon. What would be the point, then, of having the game if Diamond and/or Pearl and two DS's could handle its jobs just as well?